ul,
li {
	padding: 0;
	margin: 0;
	list-style: none;
}

.adver {
	margin: 0 auto;
	width: 500px;
	overflow: hidden;
	height: 270px;
	position: relative;
	background: url("../images/1.jpg");
}

ul {
	position: absolute;
	bottom: 10px;
	z-index: 100;
	width: 100%;
	text-align: center;
}

ul li {
	display: inline-block;
	font-size: 10px;
	line-height: 20px;
	font-family: "微软雅黑";
	margin: 0 1px;
	width: 20px;
	height: 20px;
	border-radius: 50%;
	background: #333333;
	text-align: center;
	color: #ffffff;
}

.arrowLeft,
.arrowRight {
	position: absolute;
	width: 30px;
	background: rgba(0, 0, 0, 0.2);
	height: 50px;
	line-height: 50px;
	text-align: center;
	top: 100px;
	z-index: 150;
	font-family: "微软雅黑";
	font-size: 28px;
	font-weight: bold;
	cursor: pointer;
	display: none;
}

.arrowLeft {
	left: 10px;
}

.arrowRight {
	right: 10px;
}

li:nth-of-type(1) {
	background: orange;
}